{{#xlsxAdd "xl/worksheets/sheet1.xml" "worksheet.sheetData[0].row"}}
    <row>
        <c t="inlineStr"><is><t>foo</t></is></c>
    </row>
{{/xlsxAdd}}

{{#xlsxReplace "xl/worksheets/sheet1.xml" "worksheet.sheetData[0].row[0]"}}
    <row>
        <c t="inlineStr"><is><t>xxx</t></is></c>
    </row>
{{/xlsxReplace}}

{{{xlsxPrint}}}